body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
}

.container {
  text-align: center;
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.clock {
  position: relative;
  width: 200px;
  height: 200px;
  border: 10px solid #333;
  border-radius: 50%;
  margin: 20px auto;
  background-color: #fff;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.hour-hand, .minute-hand {
  position: absolute;
  width: 50%;
  height: 6px;
  background-color: #333;
  top: 50%;
  transform-origin: 100%;
  transform: translateY(-50%);
  transition: transform 0.5s ease-in-out;
}

.marking {
  position: absolute;
  width: 4px;
  height: 15px;
  background-color: #333;
  transform-origin: center bottom;
}

.clock-number {
  position: absolute;
  width: 20px;
  height: 20px;
  text-align: center;
  font-size: 16px;
  font-weight: bold;
  color: #333;
  top: -25px;
  left: -8px;
}

#start-button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

#start-button:hover {
  background-color: #0056b3;
}

#message {
  margin-top: 20px;
  font-size: 18px;
}

input[type="number"] {
  padding: 5px;
  font-size: 16px;
  width: 60px;
  margin-right: 10px;
}

button {
  padding: 5px 10px;
  font-size: 16px;
  cursor: pointer;
  background-color: #28a745;
  color: #fff;
  border: none;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #218838;
}

@keyframes correct-animation {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(10deg); }
  100% { transform: rotate(0deg); }
}